Method for realizing line interphase fault single-ended distance measurement by means of real part characteristics of voltage drop

A technology of inter-phase fault and single-ended ranging, applied in the fault location and other directions, which can solve the problems of high application cost, high sampling rate requirements, and influence of fault location accuracy.

Active Publication Date: 2013-08-14
STATE GRID CORP OF CHINA +3
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Problems solved by technology

The traveling wave method utilizes the transmission properties of fault transient traveling waves to perform single-ended fault location. It has high precision and is not affected by the operation mode and excessive resistance. However, it requires a high sampling rate, requires a special wave recording device, and has high application costs.
The impedance method uses the voltage and current after the fault to calculate the fault loop impedance, and performs single-ended fault location measurement according to

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  • Method for realizing line interphase fault single-ended distance measurement by means of real part characteristics of voltage drop
  • Method for realizing line interphase fault single-ended distance measurement by means of real part characteristics of voltage drop
  • Method for realizing line interphase fault single-ended distance measurement by means of real part characteristics of voltage drop

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Embodiment Construction

[0015] The technical solution of the present invention will be further described in detail according to the accompanying drawings.

[0016] figure 1 It is a schematic diagram of the line transmission system applying the present invention. figure 1 Among them, PT is a voltage transformer, and CT is a current transformer. The protection device samples the voltage waveform of the voltage transformer PT and the current waveform of the current transformer CT at the installation place of the transmission line protection to obtain the instantaneous value of the voltage and current, and calculates the instantaneous value of the voltage and current obtained by sampling using the Fourier algorithm Fault phase-to-phase voltage at transmission line protection installation , fault current between phases and the negative sequence voltage between the faulted phases ; Among them, φφ=AB, BC, CA phase.

[0017] The protection device uses the transmission line to protect the fault phase-...

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Abstract

The invention discloses a method for realizing line interphase fault single-ended distance measurement by means of real part characteristics of voltage drop. According to the method, a voltage phase angle at an interphase short fault point is calculated by using fault interphase negative sequence voltage and positive sequence impedance of an electric transmission line per unit length, so that an additional fault distance generated due to transition resistance is calculated, and the fault distance from the electric transmission line protection installation position to the interphase short fault point is obtained by subtracting the additional fault distance generated due to transition resistance from the real part of a ratio of the fault interphase voltage to the voltage drop of the electric transmission line per unit length. The method solves the problem that the transition resistance and load current influence the accuracy of single-ended fault distance measurement; and when a high resistance short fault between phases of the electric transmission line happens, the method has high distance measurement accuracy, the distance measurement principle is simple, the procedure is easy to implement, the fault distance can be directly calculated without a search algorithm, the distance measurement speed is high, and the real-time performance is high.

Description

technical field [0001] The invention relates to the technical field of electric power system relay protection, in particular to a single-end distance measuring method for phase-to-phase faults of lines by using the characteristics of the real part of voltage drop. Background technique [0002] The single-end fault location method of transmission lines only uses the electrical quantity at one end of the transmission line for fault location, does not require communication and data synchronization equipment, has low operating costs and stable algorithms, and has been widely used in transmission lines. Single-ended fault location methods for transmission lines are mainly divided into traveling wave method and impedance method. The traveling wave method utilizes the transmission properties of fault transient traveling waves to perform single-ended fault location. It has high precision and is not affected by the operation mode and excessive resistance. However, it requires a high ...

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Application Information

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IPC IPC(8): G01R31/08
Inventor 曾惠敏林富洪
Owner STATE GRID CORP OF CHINA
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